The cumulative effects of modafinil are not well known though there is some evidence that it builds up neuron protection, modulates circadian rhythms and produces advantages for cognitive development. Personally I don't think these effects are so terrific that they outweigh the possible negative side effects which are also kind of hazy and unproven.

Dependency. Afinil is a great thing, and fairly benign but like anything else if you get used to it's effects you get tolerance and psychological (not physical) addiction.

I would say less extremes, I was often euphoric as an occasional user but also more short tempered according to my boyfriend. As a full time user it's more like a cleaner, more effective coffee habit, I have consistent energy don't crash in the afternoon but otherwise it's kinf of uneventful.

I love moda but can't imagine daily use it seems like it would lose it's effects and you would be back where you started.

Sounds like you are not on the tough end of the ADHD spectrum. For me daily use is more like the difference between things working well vs struggling.